土木工程与管理学报2017，Vol.34Issue(6)：36-40,5.
考虑温度作用不确定性的结构损伤识别
Structural Damage Identification Considering Uncertainty of Temperature Action
摘要
Abstract
When ambient temperature changes, the material elastic modulus accordingly varies, and structure will contract or expand for material' s thermal properties. If the deformation of beam end is constrained, the temperature change can be considered as axial force. The change of material elastic modulus and existence of axial force will affect the dynamic stiffness and influence the structure natural frequency. If they cannot be considered in the damage identification, erroneous judgment will happen. This paper proposes a numerical study to identify the damage location and severity considering uncertainty of temperature action. Firstly, the influence of temperature on elastic modulus and the mechanism of equivalent axial load are introduced. Secondly, the finite element analysis program of a simply supported beam is setup based on MATLAB. The influence of elastic modulus and axial force to structural dynamic properties are studied and compared with the numerical solution of Euler beam. The model is validated. In the end, four damage cases are constructed and the identification is carried out based on improved genetic algorithm, it can be found that under different temperature variations, the damage are identified accurately.关键词
损伤识别/温度作用不确定性/轴向荷载/改进遗传算法Key words
damage identification/uncertainty of temperature action/axial load/improved genetic algorithm分类
建筑与水利引用本文复制引用
黄民水,程劭熙,卢海林..考虑温度作用不确定性的结构损伤识别[J].土木工程与管理学报,2017,34(6):36-40,5.基金项目
国家留学基金委项目(201508420074) （201508420074）
国家自然科学基金(51378404) （51378404）
湖北省自然科学基金(2014CFB773) （2014CFB773）
